Dear w3c team,
there is a bug in css3 validator. It faulty sign a css3 file as not
valid because it doesn't parse css3 property border-radius.
There is also patch on your bugzilla forum:
http://www.w3.org/Bugs/Public/show_bug.cgi?id=11975
I hope you will fix it up asap.
Thank you and with best regards
Ing. Petr Vitasek